you wouldn’t raise pre-flop with 7-T suited because you’re not a crappy poker player. that can’t be said for everyone. 
but once that flop hit, i can see her betting that way without a problem. she landed top pair. it may not be the best, but it might be the best hand she can see (from reading the board).
so, she bet it. and when the turn comes and she lands top set, why back off?
at any rate, it sucks getting aces cracked, and when the play come totally out of left field like that it is infuriating.
oh, the suited thing, some people honestly play every hand they get suited hole cards. not a good way to win over the long run, but they do it anyway.